Kimberly M. Rich, 33, of 48 Summer St., Barre, was charged with driving under the influence of drugs, possession of crack cocaine, conspiracy to violate the drug law, and assault and battery on a police officer.

William Perez, 35, 88 School St. Barre, was charged with possession of crack cocaine, conspiracy to violate drug law and a warrant arrest.

Amy Eck, 40, 140 Country Club Blvd., Worcester, was charged with possession of crack cocaine and conspiracy to violate the drug law, as was Cheryl Rome, 54, of 108 Country Club Blvd., Worcester.

All four are scheduled to be arraigned in Dudley District Court today.

Officer Peter Mullin and the Massachusetts State Police assisted in the arrests.